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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income $ 24,883 $ 25,109 $ 36,141
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 15,529 15,282 14,615
Pension expense 3,431 7,657 2,708
Contributions to pension plan (16,000) (4,000) (2,500)
Deferred income taxes 3,511 (563) (1,367)
Gain on sale of property, plant and equipment (607) (88) (343)
Goodwill, Impairment Loss 1,800 0 0
Changes in operating assets and liabilities, net of effects of acquisitions:      
Accounts receivable, net 5,273 (4,750) (8,529)
Inventories, net 13,904 12,576 (2,987)
Accounts payable 1,393 (4,123) (693)
Commissions payable 3,300 (1,498) 3,367
Deferred revenue (380) (2,425) (3,024)
Accrued expenses and other (7,996) (2,436) (3,700)
Benefit obligations 5,393 (58) (4,685)
Net cash provided by operating activities 53,434 40,683 29,003
Cash flows from investing activities:      
Capital additions (6,877) (8,260) (13,278)
Proceeds from sale of property, plant and equipment 1,379 466 681
Payments for acquisitions, net of cash acquired (2,968) (3,386) (16,667)
Net cash used for investing activities (8,466) (11,180) (29,264)
Cash flows from financing activities:      
Cash dividends (11,218) (10,599) (9,715)
Treasury shares repurchased (4,579)
Proceeds from bank borrowings   18,000
Payments to banks for borrowings (13,912) (15,000)
Net cash used for financing activities (11,218) (29,090) (6,715)
Effect of exchange rate changes on cash 130 (1,180) 344
Net increase (decrease) in cash and cash equivalents 33,880 (767) (6,632)
Cash and cash equivalents:      
Beginning of year 23,724 24,491 31,123
End of period $ 57,604 $ 23,724 $ 24,491